@Doly,
Here's something I just found on the internet:
There are approximately 240,000 illegal immigrant sex offenders in the United States. This staggering statistic, rarely mentioned by the media, was revealed in a study by Deborah Schurman-Kauflin of the Violent Crimes Institute in Atlanta, Georgia. "It is clear," she says, "that the U.S. public faces a dangerous threat from sex predators who cross the U.S. borders illegally." What's more, she adds, "Then they gradually commit worse crimes and are continually released back into society or deported. Those who were deported simply returned illegally again."
Something else I found on the internet:
Taken from the National Alert Registry, Neighborhood Predator Report: The latest National Survey confirms there are over 374,270 registered sex offenders in the U.S. (The population of the U.S. as of Dec. 2006 is approx. 301,000,000)